/* Header styles for Danube Design Hub */

.ddh-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid rgba(15, 23, 42, 0.04);
  backdrop-filter: blur(12px);
}

.ddh-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
}

@media (min-width: 768px) {
  .ddh-header__inner {
    padding-block: var(--space-4);
  }
}

.ddh-header__brand {
  display: flex;
  align-items: center;
}

.ddh-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-900);
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.ddh-header__logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 32% 68% 60% 40% / 38% 40% 60% 62%;
  background: radial-gradient(circle at 30% 20%, #2dd4bf 0, #0f766e 40%, #0f172a 100%);
  box-shadow: var(--shadow-sm);
}

.ddh-header__logo-text {
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
}

/* Navigation */
.ddh-header__nav {
  position: relative;
}

.ddh-header__nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.ddh-header__nav-item--primary {
  margin-left: var(--space-2);
}

.ddh-header__nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  font-size: var(--font-size-sm);
  color: var(--gray-700);
  padding-block: 0.2rem;
}

.ddh-header__nav-link::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  bottom: -0.35rem;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: transparent;
  transform-origin: center;
  transform: scaleX(0.4);
  opacity: 0;
  transition: opacity var(--transition-normal), background-color var(--transition-normal);
}

.ddh-header__nav-link:hover {
  color: var(--gray-900);
}

.ddh-header__nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.ddh-header__nav-link[aria-current="page"],
.ddh-header__nav-link--active {
  color: var(--gray-900);
}

.ddh-header__nav-link[aria-current="page"]::after,
.ddh-header__nav-link--active::after {
  opacity: 1;
  background-color: var(--color-primary);
}

.ddh-header__nav-link--button {
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(15, 23, 42, 0.06);
  background-color: var(--color-primary);
  color: #ffffff;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
}

.ddh-header__nav-link--button:hover {
  background-color: var(--gray-900);
  color: #ffffff;
}

.ddh-header__nav-link--button::after {
  display: none;
}

/* Mobile toggle */
.ddh-header__toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--gray-200);
  background-color: var(--color-bg-alt);
  cursor: pointer;
  padding: 0;
}

.ddh-header__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.ddh-header__toggle-bar {
  position: relative;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-800);
  transition: transform var(--transition-normal), opacity var(--transition-normal), background-color var(--transition-normal);
}

.ddh-header__toggle-bar + .ddh-header__toggle-bar {
  margin-top: 5px;
}

/* Open state */
.ddh-header__toggle[aria-expanded="true"] .ddh-header__toggle-bar:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.ddh-header__toggle[aria-expanded="true"] .ddh-header__toggle-bar:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile layout */
@media (max-width: 767.98px) {
  .ddh-header__nav-list {
    position: fixed;
    inset-inline: 0;
    top: 64px;
    background-color: var(--color-bg-alt);
    box-shadow: var(--shadow-md);
    padding: var(--space-4) var(--space-4) calc(env(safe-area-inset-bottom, 0) + var(--space-4));
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    transform: translateY(-16px);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
    transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  }

  .ddh-header__nav-item--primary {
    width: 100%;
    margin-left: 0;
  }

  .ddh-header__nav-link--button {
    width: 100%;
    justify-content: center;
  }

  .ddh-header__nav-list.ddh-header__nav-list--open {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
    transform: translateY(0);
  }
}

/* Desktop layout */
@media (min-width: 768px) {
  .ddh-header__toggle {
    display: none;
  }
}